You may recall that I'd asked for help with power supplies, and some of you had responded with questions. Those questions didn't get answered as a result of me and Howard failing to communicate well. Anyhow, we're back on track, and tomorrow, Howard will be writing something up on what he's been working on with this.
The chip we've been planning to use is the "MAX8578". Howard wired it up on copper clad and experienced total failure. Then he got a board blank for something that had had a similar pws before and wired it up on there. Things got a little better, but still don't work. It's 5V in, 3.3V out. What we see is it starting up with some narrow pulses (to charge the supply) that slowly get wider. When it reaches about 1.5V on the output, the chip registers an over-current error and shuts off. Some time later, it resets and tries again, with the same result. If someone can investigate this chip, perhaps find a SPICE model, etc., that would be great. If that isn't enough information, we'll put up a JPG of our schematic. If we can't get this working, we'll have to investigate a more expensive chip. Thanks. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
